> at conditions that would generally be considered "non-flammable" if oxygen were involved instead "Generally considered non-flammable" doesn't even begin to d

> at conditions that would generally be considered "non-flammable" if oxygen were involved instead "Generally considered non-flammable" doesn't even begin to describe it. From (http://www.lateralscience.co.uk/Fluorine/Fluorine.html http://www.lateralscience.co.uk/Fluorine/Fluorine.html): > the problem was its collection and containment. Fluorine chemically reacts with just about everything, usually very vigorously. He fashioned collection vials from platinum, palladium and gold. All were destroyed. As to the GP: > > the most dangerous, angry, reactive, poisonous gas we know To continue the nitpicking, bear in mind that a gas is just one phase of matter for a particular chemical. What we're really after then is something from among the most reactive chemicals we know. I nominate dioxygen difluoride which will (for example) react with liquid methane at -180C. It's antics are summarized by Derek Lowe. (https://blogs.sciencemag.org/pipeline/archives/2010/02/23/things_i_wont_work_with_dioxygen_difluoride https://blogs.sciencemag.org/pipeline/archives/2010/02/23/th...)